Improvement in screw-bolts



W. 1:". SOHOWE.

Screw-Bolt.

No. 218,142.- Patented Aug. 5,1879.

WITNESSE;

INVENTDH.

,7M/@ZM rLPr'JS. PHOTO LITHDGRAPH WASHINGTON. D C.

UNITED STATES PATENT OEErcE.-

WILLIAM F. SGI-IOWE, vOF INDIANAPOLIS, INDIANA.Ll

IMPROVEMENT IN SCREW-BOLTS.

Specification forming part of Letters Patent No. 218,142, dated August 5, 1879; application led February 13, 1879.

To all whom it may concern:

Be it known that I, WILLIAM F. ScnowE, of Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Improvement in Flat-Head Bolts for for, because the nuts could not be screwed up tightly and were liable to` work loose, thus permitting the buckets to drag on the boot, and frequently be torn from the belt.

The object of -my invention is to prevent the bolt from turning while the nut is being screwed up tightly or being removed therefrom, and also to prevent the bucket from working loose on the bolts.

My invention consists in providing a screwbolt with round or disk form, thin, broad, and iiat head, provided with a nick or holes in which a screw-driver or other similar instrumeut may be inserted for holding the bolt while the nut is being screwed up tightly or removed therefrom.

The peculiar shape of the head of the bolt will not admit the slot to be cut fully across the face, because the head is so thin that the slot would weaken it. The usual construction of such a bolt-head is hat on the outside surface and extremely thin at its periphery, with a slight increase in thickness as it approaches the center or'shaft, hence this slot or recess must be milled or stamped deepest in the thickest or central part of the head, in order to retain sufcient material around the slot and edges of the head to prevent the head from breaking.

In the accompanying drawings, in which of the head of my newly-constructed bolt;-

and Fig. 3 is a sectional view of the bolt, the

. belt, and bucket.

A represents any ordinary elevator-bucket, and B the elevator-belt.

The bolt is constructed with the screwshaft G, having a round or disk form, thin, broad, and flat head C, provided with a nick, D, or holes f, in which a screw-driver or other similar instrument may be inserted for operating the bolt.

The slot or recess D is milled or stamped in the thickest part of the head, yet not so deep as to cut through the head or to weaken it by cutting through at the periphery, as shown in Fig. 3.

The bolt is used in the ordinary mannerthat is, the shaft Gr passing through the belt and rear side of the bucket, with the hat head against the belt on the outside. The nut H is then screwed on, and a screw-driver or other instrument for a like purpose is introduced into the milled or stamped recess Thus a means is provided whereby the bolt can be held and prevented from turningwhile the nut is being screwed tightly up and the head C embedded in the leather belt, or when the nut is removed.

It is obvious that the head G may be provided with two or more holes, f, as an equivalent of the slot D, adapted to receive prongs formed on the end of a screw-driver, in order to hold the bolt and prevent it from'turning while the nut H is being screwed up or removed.

I am aware that screws have been made with thick hat heads with slots cutacross the face for the screw-driver to operate in; but I am not aware that a thin broad flathead bolt has ever been constructed with a slot or recess milled or stamped in the central part, as described, for the purpose specified.

What I claim as new, and desire to secure In testimony whereof' I have signed my by Letters Patent, is name to this specification in the presence of A screw-bolt, G, having :L round or disk two subscribing witnesses.

form, thin, broad, and Het head C, provided WILLIAM F. SCHOVE.

with :L niek7 D, or its equivalent holes f, for a Vitnesses:

screwdriver, jointly with the nut; H, as and E. O. FRINK,

for the purpose specified. H. H. FULTON. 

